Diamond



FIG. 1 is a top perspective view of a diamond showing the new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a side elevation view thereof;

FIG. 5 is an opposite side elevation view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines shown in the drawings illustrate portions of the designfor a diamond that form no part of the claimed design.

CLAIM The ornamental design for a diamond, as shown and described.